XIMS: IMAP4 Client Hangs Attempting to Append Message Using SSL (239082)

SYMPTOMS

You may experience either of the following symptoms:

When an Internet Mail Access Protocol version 4 (IMAP4) client attempts to send a message to an Exchange Server computer using the APPEND command and Secure Sockets Layer (SSL) authentication, the client may stop responding (hang). This problem is known to occur with Netscape Messenger version 4.5, but it may also occur with other clients.
After an IMAP4 client connects to an Exchange Server computer, the server may end the connection unexpectedly, or may not end the connection in situations where it should.

CAUSE

These problems can occur for the following reasons:

If the server obtains the end of the message and a carriage return/line feed (CR/LF) during a single read, the CR/LF may be ignored, and therefore it is not decrypted. This causes the client to stop responding.
The server may not properly increment or decrement the counters associated with the receive chain length.

RESOLUTION

To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or later:

Component: Information Store

File name	Version
Gapi32.dll	5.5.2650.4
Mdbmsg.dll	5.5.2650.4
Netif.dll	5.5.2650.4
Store.exe	5.5.2650.4

STATUS

Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 3.

MORE INFORMATION

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.